Culture bottle



FIG. 1 is a front elevational view of a culture bottle, showing my new design, the rear elevational view being identical thereof;

FIG. 2 is a side elevational view thereof, the opposite side elevational view being identical thereto;

FIG. 3 is a top plan view thereof; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a culture bottle, as shown and described. 